Boiler-flue



R. SHELTON.

BOILER FLUE.

APPLICATION FILED NOV. 12, 1919.

Patented Feb. 17,1920.

B, Shy/f0 REUBEN SHELTON, .oracAnwu, ILLINOIS.

BOILER-FLUE.

,Specification of Letters Patent.

1 Patented Feb.'1*7;-1920.

- Application fi1ed'November"12,' 1919. Seria1'No.337,5 40.

To all whom it may concern Be it known that I, REUBEN SHE-won, a citizenof the 'United'States, residing at Carmi, in the county of WVhite and State of Illinois, have invented certain new and useful Improvements in Boiler-Flues, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to boiler flues.

The common method now employed for connecting boiler flues to the flue sheet is unsatisfactory, for the reason that the flue is only held in engagement with the flue sheet by expanding the flue. As a result of this, after the boiler has been in use for a certain length of time the flue is loosened through vibration and heat and starts to leak.

It is therefore the object of this invention to provide a flue which is not affected by heat or vibration and which is immune from leakage.

Another object is the provision of a flue that can be readily applied and removed without interfering with the remaining flues of the boiler.

Another object is the provision of a flue which is connected to the flue sheet within an opening in the sheet and which is also disposed in binding engagement with the flue sheet on both sides thereof.

With these and other objects in view, the invention consists in the improved construe tion to be hereinafter more particularly described and fully claimed and illustrated in the accompanying drawings, in which Figure l is a sectional view of flue sheet and flue showing the position of the flue after being applied.

Fig. 2 shows a sectional view of the flue sheet and flue showing the projecting end of the flue beaded into engagement with the flue sheet.

Referring to the drawings, 5 designates the flue sheet of a boiler adapted to support a bank of boiler flues. This sheet includes a plurality of openings 6 which extend therethrough to support the end of the flue 7 Each opening is internally threaded and is intended to receive the end 8 which is provided with tapering threads.

The end 8 of the flue, is threaded a distance greater than the thiclmess of the flue sheet so that when the flue is disposed in the sheet, the end of the flue projects a short distance beyond the outer surface'of the {sheet VVhen' the flue 7 is applied to-the flue sheet, it is screwed through the opening to the limit of its threaded end so that a binding action is caused by the non-threaded portion closely adjacent the threaded portion, with the inner side of the flue sheet. At the same time, a portion of the threaded end projects beyond the outer surface of the flue sheet. A washer 9 preferably of copper is disposed on the projecting end of the flue and in engagement with the outer surface of the flue sheet. The projecting end is then beaded back toward the outer surface of the flue sheet and the washer, into binding engagement therewith. This operation not only prevents movement of the flue in either direction but in addition to the air tight joint on the inner surface of the flue sheet it provides an air tight joint on the outer surface of said sheet so that it is an impossibility for liquid to pass between the end of the flue and the flue sheet.

Furthermore, this novel arrangement efii ciently braces the flue sheet and regardless of vibration and heat, remains in place as long as the metal of the boiler lasts.

From the foregoing it will be readily seen that this invention provides a novel boiler flue which is sealed steam and water tight in three places, namely that of the engagement of the threads of the flue sheet and the flue, the binding engagement of the flue with the inner surface of the flue sheet and the binding engagement of the beaded end and washer with the outer surface of the flue sheet, all of these cooperating to prevent movement of the flue so that the same is immune from leakage.

What is claimed is 1. A boiler flue comprising a flue sheet having a threaded opening, a flue in said opening, said flue including tapering threads on the end thereof, said tapering threads extending a greater distance than the length of the opening, and causing the flue to bind in the opening, and a malleable metal washer on the projecting end of said flue, said end being beaded to jam the washer on said end and against the flue sheet between said bead and the flue sheet.

2. A boiler flue comprising a flue sheet having a threaded opening, a flue in said opening, said flue including tapering threads on the end thereof, said tapering threads ,being headed to jam the washer on said end and against the flue sheet between said bead and the flue sheet, the threads of said beaded portion penetrating the outer surface and the inner edge of the washer.

3. A boiler flue comprising a flue sheet having a threaded opening, a flue, the end of said flue having tapering threads, said flue being screwed into'the opening to the limit of said threads, to cause the extremity of the threaded portion and the closed adjacent unthreaded portion of the flue to bind on one side of the flue sheet, and a malleable metal washer on the projecting end of the flue, said projecting end being headed into binding engagement with the flue sheet through the medium of the washer on the other side of the flue sheet, a V

In testimony whereof I hereunto aflix my signature. V

Y REUBEN SHELTON. 

